import tools as Tools
import data as Data

screen = Tools.screen
Actor = Tools.Actor
Animation = Tools.Animation

class Main:
    def __init__(self):
        Tools.Debug(3,'Part4')
    def Enter(self):
        pass
    def Update(self):
        screen.fill((0,0,0))
        screen.draw.text("首先，让我们看看它是如何被定义的.",(100,100),"osans4.ttf")
        screen.draw.text("在同一个平面上互相垂直且有公共原点的两条数轴构成平面直角坐标系, 简称直角坐标系.",(100,150),"osans4.ttf")
        screen.draw.text("通常, 两条数轴分别置于水平位置与垂直位置, 取向右与向上的方向分别为两条数轴的正方向.",(100,200),"osans4.ttf")
        screen.draw.text("水平的数轴叫做x轴(x-axis)或横轴, 垂直的数轴叫做y轴(y-axis)或纵轴, x轴y轴统称为坐标轴, ",(100,250),"osans4.ttf")
        screen.draw.text("它们的公共原点O称为直角坐标系的原点(origin).",(100,300),"osans4.ttf")